* {
    margin: 0;
    padding: 0;
}

#add_items,
#reduce_items,
#items_table,
#cal_table {
    border: 1px solid black;
    border-collapse: collapse;
    width: 600px;
    margin: 0 auto;
    text-align: center;
}

#add_items {
    margin-top: 20px;
    height: 200px;
    line-height: 28px;
}

#reduce_items {
    margin-top: 20px;
    height: 90px;
    line-height: 28px;
}

#add_items p,
#reduce_items p {
    font-size: 20px;
    font-weight: bolder;
    border-bottom: 2px solid black;
}

#add_item_btn,
#reduce_item_btn,
#select_all_items_btn {
    margin: 5px;
    cursor: pointer;
    width: 80px;
    height: 20px;
    border-radius: 10px;
    line-height: 18px;
}

#items_table tr,
#items_table tr th,
#items_table tr td {
    border: 1px solid black;
    border-collapse: collapse;
    text-align: center;
    height: 30px;
}

#items_table {
    margin-top: 20px;
}

#cal_table tr,
#cal_table tr th,
#cal_table tr td {
    border: 1px solid black;
    border-collapse: collapse;
    text-align: center;
    height: 30px;
    line-height: 28px;
}

#cal_table {
    margin-top: 20px;
}

#cal_table input {
    text-align: center;
}

caption {
    border: 1px solid black;
    font-size: 20px;
    font-weight: bolder;
}

.add_cart ,.del_cart{
    width: 80px;
    height: 20px;
    border-radius: 10px;
    text-align: center;
    line-height: 18px;
    cursor: pointer;
}

#del_btn {
    width: 50px;
    height: 20px;
    border-radius: 10px;
    text-align: center;
    line-height: 18px;
    cursor: pointer;
}

#reduce,
#add {
    width: 20px;
    height: 20px;
    border-radius: 10px;
    border: none;
    text-align: center;
    line-height: 20px;
    cursor: pointer;
}

#items_num {
    border: none;
}

#submit {
    width: 80px;
    height: 20px;
    border-radius: 10px;
    text-align: center;
    line-height: 18px;
    cursor: pointer;
}